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|A low-profile (λ/43) miniaturized multi-element antenna is presented, which displays vertical polarization with an omni-directional radiation pattern. The antenna uses a logarithmic spiral shape as the main radiating element such that the impedance bandwidth of the antenna is much improved in comparison with both a strip-line square spiral design and a strip-line circular spiral design. The antenna demonstrates stable gain and useful efficiency over the operating frequency band. Significantly, the antenna provides a low profile, omnidirectional pattern in the azimuth plane, polarizes normal to the ground-plane with a 1.2% bandwidth and 0.5 dBi gain. |
|AA6061 aluminium alloy |
|AA6061-T6 aluminum alloy |
|AA7075-T6 aluminum alloy |
|Abnormal loads |
|Above-knee prosthesis |
|Abrasive wear |
|Abrupt contraction |
|ABS images |
|Absorbing media |
|Absorption coefficient |
|Absorption measurements |
|Abutment; Equilibrium scour; Experiment; Numerical computation; SGUM model; SWEs model; Time development |
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